"non-isotropic radiation profiles" is probably better expressed as the ability to produce light that can be modulated differently in different directions. That's what's required to show proper view dependent shading on a surface, and what's required to turn off a voxel that's behind another voxel from a particular view angle.
That's arguably a different class of display, and an extremely complex one.
To build it you'd likely want to sacrifice vertical parallax (to allow the use of a spinning lenticular sheet or something else, and to reduce the information capacity required), but there's no fundamental reason that prevents a full parallax display of this type (a spinning integral photograph).
From an engineering complexity point of view, it's the hardest of all worlds.
That's arguably a different class of display, and an extremely complex one.
To build it you'd likely want to sacrifice vertical parallax (to allow the use of a spinning lenticular sheet or something else, and to reduce the information capacity required), but there's no fundamental reason that prevents a full parallax display of this type (a spinning integral photograph).
From an engineering complexity point of view, it's the hardest of all worlds.